Does it? I can’t find anything in the code[0] (after 2 minutes) to suggest that. Not saying you’re wrong (I haven’t checked), but it doesn’t appear to access your history at all.[1]
They should remove the permission request then, because it asks for it when you install from the chrome extension store. If the code is the same as the one in the repo, it shouldn't matter.
[0]: https://github.com/etcet/HNES
[1]: https://github.com/etcet/HNES/search?q=history&type=